Floodlight



Dec. 14 1926. 1,610,609

H. L. JOHNSTON FLOODLIGHT Filed Jan. 16, 1925 WITNESSES:

INVENTOR I raLJ/msfon BY 0 ATTORNEY Patented Dec. 14, 1926.

teases ri r trifle-1 nowann L. Jonnsron, or roansr nrrrns sensual-r,rnnnsvnvanra, assrenon ,ro wnsrrnenousn rinncrnrc a rirnivcrncrnarne correalty, a cezaronarron or PENNSYLVANIA.

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Application filed January 18, 1925. Serial No. 2,983.

lily invention relates to lighting fixtures and particularly to a screendevice for lightprojecting apparatus.

it is among the objects of my invention 5 to provide a device forretaininga ligh tmodifying screen or lens-like partition in front 01 theaperture of the lamp casin Another object of my invention is to providea device for supporting the screen in a substantial manner, but not insuch rigid manner that it will be Warped or broken after having beensuccessively heated and cooled.

Devices of this character are used for Hood lighting. Color screens areplaced in front of the light aperture for modifylng the lightingefl'ect. One form of screen he etoiore used for this purpose is composedof a gelatinous or gluey substance, rezemblrng i0 fish-glue, whichcontracts upon heat1ng. Such screens are usually made of thin ma terialthat upon cooling Will not spring back to its original form but thescreens will i rather Warp or sag, even When they are held loosely.Devices of thischaracter have heretofore been provided With means forrigidly holding the screens, but the screens, after continued heatingand cooling,became badly Warped and finally broke.

My invention provides means for circulating air on both sides of thescreen and neans for holding the screen loosely enough to permit aslight movement thereof Without undue stretching or tentering. I alsoprovide imoroved means for supporting the screen and for preventingsagging or Warping thereof due to heating.

In the drawings, constituting a part hereof, and in which like numeralsdesignate like parts, I

Figure l is a front elevational view of a flood light, a

Fig. 2 is a View partly in side elevation and partly in cross-sectionalong the line EIIH of Fig. 1; and

Fig. 3 is a fragmentary View of the brackct showing a portion of thelamp casing and holder in cross-section.

A lamp casing 1 is mounted on a base or standard 2 in any suitablemanner. A screen 3 is mounted in front of the aperture i of the lampcasing, which may be provided with or without a lens. The holder for tiescreen comprises a stationary ring or flange 5 that is which, in turn,is clamped to a ring or bead 7 of the lamp casing 1 by means of a screw8. An upstruck portion 9 of the bracket disposed against the bead 7 ofthe lamp casing Whichis held'rigidly between the screw 8 and the.portion 9. Another portion 10 of the bracket extends outwardly from thelamp casing providing space between the stationary ring, an the lampcasing or lens through Which air circulatesand cools the screen.

A hook-like extension or stop member 11 01"- the bracket extends aroundthe edge of he stationary ring 5 and then inwardly in front thereof toprovide a space for accommodating amovable ring 12.

Stationary ring 5 is provided With a flange 13 at its inner marginhaving regularly spaced openings 14 located tl1erein','s o that WhenWires 15 are tnreaded through the openings, the Wires are equally spacedand are parallel to each other. The movable rii g' 12 is provided With asimilar-flange 17,0geningsl8 and Wires i9, and also With an opening QOin theouter periphery solocated that when it coincides with one of thestop members 11, the Wires '15 and 19 are non-parallel.

The screen is mounted by placing it against the Wires 15. The movablering is then placed in two of the stops 11 and the in the first instanceis protected from the direct heat of the lamp. Supporting Wires aredisposed on' both sides. of the screenB. The rings that frictionallyretain the screen at the edges, are at the same time so resiliout thatthe screen is permitted to contract slightly when unduly stretched bythe effect of the heat.

Although I have shown and described a specific structure embodying myinvention, I do not Wish to be limited thereto, as modiattached to aportion 6 or" a bracket III fications of my invention will suggestthemselves to those skilled in the art without departing from the spiritof my invention, the scope of which is defined in the annexed claims.

I claim as my invention:

1. A lighting unit comprising a lamp enclosure, a fixed frame member,brackets secured to said enclosure for supporting said ixed frame, saidbrackets being bent around the edge of said frame and forming retainingfingers, a movable apertured frame having an opening in the peripherythereof, said fingers being adapted to engage the periphery of saidmovable "frame and to release said frame when the aperture thereincoincides with one of said fingers.

2. A screen device for lighting units coirorisins a screen for modifyinthe character of the projected light, an apertured stationary member forthe passage of light rays, an apertured movable member coextensive withand cooperating with said stationary member for holding said screen,0ppositely extending flanges forming the margin of the apertures in saidmembers, systems of wires traversing said apertures, means in saidflanges for spacing said systems of wires, brackets on said stationarymember having offset members for spacing said screen from the lampenclosure, extensions in said brackets for engaging said re movablemember, said removable member having means for permittingthedisengagement thereof when it is rotated into a predeterminedposition.

3. A screen device for lighting units which comprises a screen formodifying the character of the projected light, an apertured stationarymember for the passage of light rays, an apertured movable membercoextensive with and cooperating with said stationary member foririctionally retaining said screen at the outer margin thereof,oppositely extending flanges forming the margin of the apertures in saidmembers, systems of Wires traversing said apertures, means in saidflanges for spacing said systems of wires, brackets on said stationarymember having offset members for spac' .g said screen from the lampenclosure, extensions in said brackets for engaging said removablemember, said removable mei'nber having means for permitting thedisengagement thereof when it is rotated into a predetermined position.

4%. A screen device for lightin unitwhich comprises a screen formodifying the character of the projected light, an apertured stationarymember for the passage of light rays, an apertured movable membercoextensive with and cooperating with said stationary member for holdingsaid screen, oppositely extending flanges forming the margin of theapertures in said members, systems of: wires traversing said apertures,means in said flanges for spacing said systems of wires, brackets onsaid stationary member having offset members for spacing said screenfrom the lamp enclosure, e:;tensions in said brackets for engaging saidremovable member, said ren'iovable member having means for permittingthe disenga ement thereof when it is rotated into a predeterminedposition, ,aid disengaging means being so disposed that said system ofwires are non-parallel when said removable men her is in the disengagingposition.

In testimony whereof, I have hereunto subscribed my name this 30th dayof December 1924.

HUWARD L. JOHNSTON.

